Your question is very good, and there seems to be little information on this available.

What little info I have seen indicates (with significant interpolation in my part ) the circuit topology and circuit is the same if not identical ... Differences in topology are likely to be minor (if any)

I would expect the power supplies to be enhanced, and that the main advance lies here.

"The Xono is based on the design pioneered in the Aleph Ono. The basic Ono design has not changed but been extend and refined. The separate power supply combined with the additional filtering and dual mono power supply design contribute to the lower noise floor and sonic improvements. The main circuit board layout has been completely revised to reduce noise, shorten the signal path and reduce the length of connecting wires. Sonically critical parts have been optimized and upgraded through continued extensive listening tests. "

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As far as I have understood that SuSy-thing (I am not too deep into that matter), it gains its benefits from a balanced topology which the XOno definitely is not.
Like on the Aleph Ono, the inverted output is generated at the end of the whole thing.
As far as I remember - I had an XOno about one and and a half years ago for some weeks - the amplifier circuit itself is indeed nearly identical to that of the Aleph Ono.
---
Holger

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

Certainly one of the best phono amps I have ever listened to.
What I found the most impressive was its extreme dynamics and power, not that sweet and smooth "analogue" sound. It's delivering an enormous amount of detail, too. Great machine.
---
Holger

FWIW this is my interpretation of Ono. Transformers are separate. Active circuit contained on a small board. To achieve shorter signal path, I mounted resistors on the traces' side (actually I made a mistake). DC coupled, MM stage only.

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

__________________www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC